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Can someone please help me...i am not getting the answer on these one please.. A survey of 144 retail stores revealed that the average price

Can someone please help me...i am not getting the answer on these one please..

A survey of 144 retail stores revealed that the average price of a stereo was $375 with a standarddeviation of $20. What is the 95% confidence interval for the population mean price?

Thank you!

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